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TheCD45 exon usage pattern of various CD8 + and CD4 + T cell lines was studied. By using the reverse transcription-polymerase chain reaction (RT\PCR) and Southern analysis with exon specific or exon junction probes, we showed that all of the cytotoxic T cell lines and the majority of the helper T cells expressed the 789 isoform as a major splice variant. Expression of the splice product...